Flare-Type Hydraulic Fittings - MacDon FlexDraper FD1 Series Operator's Manual

8.1.3 Flare-Type Hydraulic Fittings

1. Check flare (A) and flare seat (B) for defects that might
cause leakage.
2. Align tube (C) with fitting (D) and thread nut (E) onto
fitting without lubrication until contact has been made
between flared surfaces.
3. Torque fitting nut (E) to specified number of flats from
finger tight (FFFT) or to a given torque value in
Table 8.6, page 580.
4. Use two wrenches to prevent fitting (D) from rotating.
Place one wrench on fitting body (D), and tighten
nut (E) with other wrench to torque shown.
5. Assess final condition of connection.
Table 8.6 Flare-Type Hydraulic Tube Fittings
SAE Dash Size Thread Size (in.)
-2
-3
-4
-5
-6
-8
-10
-12
-14
-16
-20
-24
-32
-40
59. Torque values shown are based on lubricated connections as in reassembly.
214683
Nm
5/16–24 4–5
3/8–24 7–8
7/16–20 18–19
1/2–20 19–21
9/16–18 30–33
3/4–16 57–63
7/8–14 81–89
1-1/16–12 113–124
1-3/16–12 136–149
1-5/16–12 160–176
1-5/8–12 228–250
1-7/8–12 264–291
2-1/2–12 359–395
—
3–12
REFERENCE
C
Figure 8.6: Hydraulic Fitting
Torque Value 59
lbf·ft
3–4
5–6
13–14
14–15
22–24
42–46
60–66
83–91
100–110
118–130
168–184
195–215
265–291
—
580
B
A
E
Flats from Finger Tight (FFFT)
Swivel Nut or
Tube
—
—
2-1/2
2
2
2
1-1/2
1-1/2
1-1/2
1-1/2
1
1
1
1
D
Hose
—
—
2
2
1-1/2
1-1/2
1-1/2
1-1/4
1-1/4
1
1
1
1
1
Revision A